An excellent way to increase the output of two and three battery Surefire flashlights, the KX4 LED conversion head fits any Surefire flashlights using a P60L. P60, or P61 LED assembly and increases output by 50%. This conversion head also allows you to upgrade your Surefire incandescent flashlights equipped with P60 or P61 incandescent lamps. Adding the virtually indestructible LED mazimized output up to 120 lumens and tactical runtime from 2 to 3.3 hours depending on the flashlight model. High-strength aluminum costruction with a hard-anodized finish and weatherpoof with O-ring and gasket sealing, the KX4 LED conversion head is backed by Surefire's No-Hassle Guarantee.